Systematics/Phytogeography / Taxonomie/ Section
Chang, Ying , Graham, Sean W. .
Inference of phylogenetic relationships in Andreaeaceae and of the placement of Andreaeaceae and Andreaeobryaceae in moss phylogeny.
Andreaeaceae represents one of the earliest splits in moss (Bryophyta) evolution. It consists of one genus Andreaea and about ~50-75 species. It is primarily distributed in cool temperate and subpolar regions, on sicliceous rocks. The closest living relative may be Andreaeobryum macrosporum (the sole member of Andreaeobryaceae), but the relationship of these two families to each other and to the other major clades of mosses is not yet settled. In this study, we examine current hypotheses of the relationships of Andreaea and Andreaeobryum to other mosses using 14 plastid genes (~11 kb before alignment) in the context of a broad sampling of peristomate and non-peristomate mosses. Phylogenetic relationships within Andreaeaceae are also not well understood. Andreaea is generally divided into two subgenera: Chasmocalyx and Andreaea. Subgenus Andreaea is further divided into two sections: Nervia and Andreaea. Subgenus Chasmocalyx and section Nerviae are composed of costate taxa (~4 and ~9 species, respectively), while section Andreaea comprises the ecostate taxa. The monophyly of these subgenera and sections has not been tested, and phylogenetic relationships among their species remain unclear. We inferred the phylogeny of Andreaea using six plastid DNA markers (three protein-coding genes and three non-coding regions). Our initial sampling has focused on the costate species and includes a representative selection of ecostate taxa. Preliminary analyses suggest that some members of the costate section Nerviae are sister to a clade of ecostate taxa.
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1 - University of British Columbia, UBC Botanical Garden and Certre for Plant Research, 6804 SW Marine Drive, Vancouver, BC, V6T 1Z4, Canada
2 - University of British Columbia, Botanical Garden And Centre For Plant Research, 6804 Sw Marine Drive, Vancouver, British Columbia, V6T 1Z4, Canada
Presentation Type: Oral Paper:Papers for Sections
Location: Room 6/Woodward
Date: Tuesday, July 29th, 2008
Time: 8:00 AM